On Monday, MTV News reached out to a rep from Atlantic Records, the group's label, who shot down rumor #1 but did not address rumor #2.

"Cassie is not joining DK," the rep said. "Cassie is set to release her second solo album in spring of '09."

But what about the Shannon rumor? At press time, the rep had not responded to repeated queries on that issue.

Duran's blog post reads in part: "You remember Shannon, the nice, quiet, married girl who was a great team player. Well, guess little momma has more b---s than all the rest of them! Tired of the drama, cat fights and Diddy, she hands in her microphone and tells Mr. Badboy Worldwide where to stick it!"

On the season finale of "Making the Band 4" earlier this month, Diddy told O'Day, "See, your attitude is gonna have you in a dark and lonely place. ... What you need to do, at the end of the day, is humble yourself," and told Woods that she got "caught up in the wrath" of O'Day.